The three wise men in the Bible are considered saints in the Catholic Church. For some unknown reason, Balthasar isn't included in the book. I guess the author couldn't include every saint.

There is also a Bl. Balthasar de Torres (he's called Bl. or Blessed because he's just been beatified (eg. not a canonized saint). Two miracles attributed to a particular saint's intercession are usually needed for sainthood to be declared.